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    SubjectRe: [PATCH 1/1] af_packet: don't enable timestamps in mmap'ed sockets
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    On jue, 2007-08-09 at 18:33 +0400, Evgeniy Polyakov wrote:
    > On Thu, Aug 09, 2007 at 04:21:54PM +0200, Unai Uribarri (unai.uribarri@optenet.com) wrote:
    > > The attached patch removes the automatic timestamp activation, that
    > > only mmap'ed AF_PACKET sockets perform. I known it can break user
    > > applications, but I believe that it's the correct solution.
    >
    > How tcpdump with mmap libpcap will work with it?

    In Linux, you can enable timestamps on any socket executing:

    int val = 1;
    setsockopt(sock, SOL_SOCKET, SO_TIMESTAMP, &val, sizeof(val));

    PD: Current release of tcpdump doesn't mmap the reception ring and
    timestamps packets at user space with gettimeofday. It isn't the best
    performing alternative, but it's portable.



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